/Engine/Source/Runtime/Engine/Public/Net/RepLayout.h
Finds any properties in the Shadow Buffer of the given Rep State that are currently valid (mapped or unmapped) references to other network objects, and retrieves the associated Net GUIDS.
void GatherGuidReferences ( [FReceivingRepState](API\Runtime\Engine\Net\FReceivingRepState) *__restrict RepState, struct [FNetDeltaSerializeInfo](API\Runtime\CoreUObject\UObject\FNetDeltaSerializeInfo) & Params, [TSet](API\Runtime\Core\Containers\TSet)< [FNetworkGUID](API\Runtime\Core\Misc\FNetworkGUID) > & OutReferencedGuids, int32 & OutTrackedGuidMemoryBytes ) const